diff --git a/cpdfchop.ml b/cpdfchop.ml
index df3f8f1..40a2f3a 100644
--- a/cpdfchop.ml
+++ b/cpdfchop.ml
@@ -1,8 +1,6 @@
 open Pdfutil
 open Cpdferror
 
-(* 1. FIXME btt / rtl / columns *)
-
 (* Chop a single page into pieces. We prefer the cropbox when available. We set
    mediabox only, and delete any other boxes. We delete /Annots, since
    duplicate annotations are not allowed. *)
diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index 114ceca..896aa25 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -2314,10 +2314,10 @@ and specs =
       " Impose in columns rather than rows");
    ("-impose-rtl",
       Arg.Unit setimposertl,
-      " Impose right-to-left on rows");
+      " Impose right-to-left");
    ("-impose-btt",
       Arg.Unit setimposebtt,
-      " Impose bottom-to-top on columns");
+      " Impose bottom-to-top");
    ("-impose-margin",
       Arg.Float setimposemargin,
       " Add margin around whole imposed page");
@@ -2330,6 +2330,15 @@ and specs =
    ("-chop",
       Arg.String setchop,
       " Chop x by y");
+   ("-chop-columns",
+      Arg.Unit setimposecolumns,
+      " Chop in columns rather than rows");
+   ("-chop-rtl",
+      Arg.Unit setimposertl,
+      " Chop right-to-left");
+   ("-chop-btt",
+      Arg.Unit setimposebtt,
+      " Chop bottom-to-top");
    ("-pad-before",
       Arg.Unit (setop PadBefore),
       " Add a blank page before the given pages");
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index b8dd9d7..2961aab 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -5,6 +5,8 @@
 %Document -list-images[-json], -list-image-uses[-json], -image-resolution-json
 %Document -raw for -extract-images
 %Add note to -fast about content sharing (with reference to -chop, but in general too)
+%Document -chop
+%Replace -impose-rtl etc with -rtl etc.
 \documentclass{book}
 % Edit here to produce cpdfmanual.pdf, cpdflibmanual.pdf, pycpdfmanual.pdf,
 % dotnetcpdflibmanual.pdf, jcpdflibmanual.pdf jscpdflibmanual.pdf etc.